Valve-refacing tool



W. RDTHER.

VALVE REFACING TOOL.

APPLICATION FILED AUGJ. 1920.

1,387,666, Patented Aug. 16, 1921.

2 SHEETS-SHEET 1.

gvwento'n attomwq W. ROTHER.

VALVE REFACING TOOL.

APPLICATION FILED Aue.4. 1920.

Patenfed Aug. 16, 1921.

2 SHEETS-SHEET 2- Eltbozmaq UNITED STATES PATENT OFFICE.

WALTER ROTHER, OF DETROIT, MICHIGAN, ASSIGNOR TO B.

L. TOOL AND DIE COMPANY, OF DETROIT, MICHIGAN, A COPARTNERSHIPCOMPRISING VIALTER ROTHER, ELMER J. FOX, AND LEWIS W. LOVET.

VALVE-REFACIN G TOOL.

Specification of Letters Patent.

Patented Aug. 16, 1921.

Application filed August 4, 1920. Serial No. 401,094.

T 0 all whom it may concern Be it known that I, lumen ROTHER, a citizenof the United States, residing at Detroit, in the county of Wayne andState of Michigan, have invented a new and useful Valve-Refacing Tool,of which the following is a specification.

his invention relates to valve refacing tools, and more particularly totools for refacing the tappet valves of internal combustion engines.

It is the object of the invention to provide a tool, particularlyadapted for the use of motor vehicle repair shops and garages, whichtool is adapted to quickly and accurately effect the refacing of atappet valve.

In attaining this object the invention contemplates a cutting tooladapted to be manually rotated through a suitable crank and gearing andprovided with a plurality of conically inclined cutting blades forming aseat for the valve, and a clamping means adjustable to feed the valveagainst said blades with such pressure as will effect the desired cut,said clamping means having such engagement with the valve as to restrainthe same from rotation.

A preferred embodiment of the invention is illustrated in theaccompanying drawing, wherein,

Figure 1 is elevation.

Fig. 2 is a plan view of the same.

Fig. 3 is a vertical sectional view taken on line 33 of Fig. 2.

Fig. 4 is a horizontal sectional view taken on line H of Fig. 1.

In these views, the reference character 1 designates a base plateapertured as inclicated at 2 for engagement by screws or the likewhereby the tool mav be secured to a suitable work bench or table. Fromsaid base there rises centrally and integrally a socket journal aring 3receiving a tubular stub shaft 4 w h integrally carries a bevel gear 5just abode said bearing. Said shaft is rotatively rethined in saidbearing by a pin 6 radiallyfifiounted in the bearing and projecting intoan annular groove 7 in the shaft Prefera ly the pin 6 has a pressure fitin a bore of the bearing, being threaded u on its outer end for enagement by a nut 8 which bears upon a washer 9 seated a view of the toolin side and a hand crank 3 is mounted upon said bearing.

depression, there is mounted a plurality of cutting blades 15 in thewall of said depression and conforming inclination of said wall. Saidblades are respective channels by rigidly held in their such as thescrews 17.

any suitable means, Preferably the blades 15 are substantially flushwith the conical wall of the depres- S1011 14 but have cutting edgejecting sufficiently above said refaeing of a valve. At 18 is indicateda tappet valve engaging the blades 15, the stem 19 of said valve beingaccommodated with1n the opening of the tubular shaft 41 and within analined opening 20 in the base 1.

As a common means for holding the valve 8 against rotation and forfeeding said valve against the cutting blades 15, there 21 mountedco-axially with the shaft 4 above the same, the lower said screw beingprovided with a head 22 for bearing upon the valve 18, and the upper endhaving an actuating handle 23 thereupon. Intermediate said head standardincline of an engine ing 24 terminally formed upon a horizontal end of astem 26 which fits into a socket 27 integrally rising from the base 1. Aset-screw 28 is mounted in the socket 27 to bear upon the stem 26 andhold the latter in a desired position of both sliding and rotativeadjustment.

Considering now the operation of the described invention, when the sameis not in use, the stem 26 is rocked to dispose the mounting 24 out ofalinement with the cutter axis, as is shown in Fig. 2. After a tappetvalve requiring refacing has been disposed within the depression 14,resting upon the blades with its stem depending through the centralopening of the shaft 1 and opening 20 of the base, the stem 26 is rockedto aline the screw 21 with the shaft 1. The handle 23 is then turneduntil the screw 21 is lowered sufliciently to engage 29 with sockets 30of the tappet valve, and thus lock said valve against rotation relativeto said screw. The operator, while maintaining with one hand anadjustment of the screw 21 such as to press the valve 18 against theblades 15 turns the crank 13 with the other hand, and thus rotativelydrives the blades 15. If necessary, the screw 23 may be turnedsufliciently during rotation of the crank to gradually feed the tappetvalve against the blades, as the inclined bearing face of said valve iscut away. During the cutting operation, the set-screw 28 is kepttightened to maintain the screw 21 rigidly in alinement with the shaft4. Sufiicient clearance is afforded within the opening 20 and that ofthe shaft 4 around the valve stem 19 to allow escape of the finecuttings which are removed from the valve by the blades.

The described tool satisfies the demand for a comparatively inexpensivemeans or quickly and accurately effecting the refacing of tappet valves.

What I claim is 1. A valve refacing tool comprising a shaft, drivingmeans for said shaft, a plurality of cutting blades carried by saidshaft, 7

and conically inclined to the axis thereof, the cutting. edges of saidblades providing a seat for a tappet valve, and means or maintaining anaxial pressure upon a tappet valve engaging said blades and. forrestraining said valve from rotationJ 2. A valve refacing toolcomprising a shaft, driving means for said shaft, a head upon said shaftformed with conical recess having the angle of inclination of a standardtappet valve, a plurality of blades carried by said head within saidrecess con forming to the angle of inclination thereof, the cuttingedges of said blades being adapted to provice a seat for a tappet valve,and means for maintaining an axial pressure upon a tappet valve engagingsaid blades and for restraining said valve from rotation.

3. A valve refacing tool comprising 4 a shaft, driving means for saidshaft, a pluthe pins rality of cutting blades carried by said shaft, andconically inclined to the axis thereof, the cutting edges of said bladesproviding a seat for a tappet valve, a screw alined with said shaft, aclamping head upon one end of said screw for blades, an actuating handleupon the other end of said screw, and a mounting for the screwadjustable to shift the screw into or out of alinement with said shaft.

4:. A valve refacing tool comprising a shaft, driving means for saidshaft, a plurality of cutting blades carried by said sha and conicallyinclined to the axis thereof, the cutting edges of said blades-providinga seat for a tappet valve, a screw parallel to said shaft, a rock-armproviding a mounting for said screw adjustable to shift the screw intoor out of alinement with said shaft, means for holding said arm rigidwhen the screw is alined with said shaft, a head upon. one end of thescrew engageable with a tappetvalve seated on said blades to press thevalve against the blades and adapted to restrain the valve fromrotation, and an ac" tuating handle carried by said screw. 7

5. A valve refacing tool comprising a base, a socket bearing integrallyrising from said base, a tubular shaft j ournaled in said bearing, agear integrally surmounting said shaft and formed with a conicaldepression, the incline of said depression being equal to that of astandard tappet valve, said tubular shaft communicating at one end withsaid depression and at the other with an opening through said base, aplurality of cutting blades secured to said gear within said depressionand conforming to the incline of the latter, .said blades providing aseat for a tappet valve, the stem of which is accommodated by theopening ofsaid tubular shaft and base, an adjusting screw for exerting.pressure upon said tappet valve against said bla l es, a mounting forsaid screw ad- 'ustable to shift the screw into or out of alinement withsaid sha-ft, a second gear having driving engagement with the firstmentioned gear and a crank for driving said gears. I

In testimony whereof I sign this specification.

-WALTER ROTHER.

presslng a valve against said,

